Digital mole monitoring
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Basic principle of digital dermoscopes
A hand-held dermatoscope is attached to a digital video camera. The camera is connected to a monitor, that displays the dermoscopic image in real time. A computer allows to capture and storage the images from the camera.
Digital dermoscopy can improve diagnostic sensitivity for early melanoma by identifying changes in lesions over time that indicate impending or incipient malignancy and it can reduce the number of biopsies of benign lesions that are biologically indolent (senescent, not changing).
Benefits of digital mole monitoring
- Simpler monitoring of lesions
- Images of the same lesion obtained at different points are easy to compare
- Enables to diagnose small, inconspicuous and featureless melanomas by detecting change over time
- Helpful for high risk individuals with multiple pigmented lesions
- Patient participation in the examination
Indications and contraindications
- Digital monitoring should be reserved for small and flat melanocytic lesions, that demonstrate no obvious clues to melanoma.
- Regardless of how one uses monitoring, knowing which lesions are unsafe to monitor is essential. Monitoring is performed on potential melanomas.
- Monitoring by digital monitoring is especially suitable for patients with multiple nevi. For these high risk patients, lesions to be monitored are selected randomly. It is recommended to evaluate and re-image as many lesions as possible at each consultation.
- When examining patients with multiple nevi, it is recommended to dispense with the documentation of melanocytic lesions that are smaller than 3mm in diameter.
- Nodular melanomas can grow rapidly even in the early stages of evolution. Nodular lesions that cannot be diagnosed as benign with absolute certainty must be excised at the initial consultation.
Interpretation of changes
Distinctions are made on the basis of changes in size, color and structure.
Changes in size
- Symmetrical: the shape of the lesions remains the same
- Asymmetrical: tha shape changes
Changes in color
- A pre-existing color (usually brown) appears lighter or darker
- A new color is seen
Changes in structure
- Disappearance of an existing pattern
- Appearance of a new pattern
- Presence of basic elements of a pattern in greater or reduced numbers (such as dots or clods)
every three months or less
Is performed for lesions, that because of history of appearance, cannot be deemed benign with absolute certainty at the initial examination
every six months to one year
Is mainly used for randomly selected lesions with no features to suggest malignancy, typically in patients with multiple nevi
Growing nevus or melanoma?
- Nevi stop growing at some time whereas melanomas do not.
- In adults, the proportion of nevi that show significant changes in the course of a year is less than 5%.
- Changes in color almost never occur in nevi. Significant structural changes are mainly observed in melanoma.
- Most of nevi do not change over one year. Monitoring over intervals longer than one year is not recommended.
- The longer the monitoring period, the more noticeable the changes are.
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